WORM_VB.DIL


 ALIASES:

Trojan:Win32/Otran (Microsoft); W32/Rabb.worm (McAfee); Suspicious.MH690 (Symantec); Worm.Win32.VB.ge (Kaspersky); Trojan.Win32.Packer.RLPackV1.15-V1.17a (ep) (Sunbelt); Worm/VB.BAD (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

196,334 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 Jul 2013

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
StubPath = "%System%\JK~.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32

HKEY_CLASSES_ROOT\AsHide.sHide

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib
Version = "2.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
ProgID = "AsHide.sHide"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
TypeLib = "{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
VERSION = "2.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AsHide.sHide
Clsid = "{6D11DB99-60E8-4D12-9F2A-199B625C2584}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"

It deletes the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
{4D36E967-E325-11CE-BFC1-08002BE10318}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Network\
{4D36E967-E325-11CE-BFC1-08002BE10318}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AsHide.sHide\Clsid

Dropping Routine

This worm drops the following files:

  • %Windows%\ILTZ.bat
  • %Windows%\IOTZ.bat
  • %Windows%\DLL.bat
  • %Windows%\GHO.bat
  • d:\Rabbit.exe
  • e:\Rabbit.exe
  • f:\Rabbit.exe
  • %System Root%\Rabbit.exe
  • h:\Rabbit.exe
  • g:\Rabbit.exe
  • d:\AutoRun.inf
  • e:\AutoRun.inf
  • f:\AutoRun.inf
  • %System Root%\AutoRun.inf
  • h:\AutoRun.inf
  • g:\AutoRun.inf
  • %Windows%\loveRabbit.bat
  • %System%\sha~.bat

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This worm connects to the following possibly malicious URL:

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {4bf41072-b2b1-21c1-b5c1-0305f4155515}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
    • System
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}
    • 2.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}\2.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {123E26D9-0733-437C-B579-A3B1F32A5DDE}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID
    • {6D11DB99-60E8-4D12-9F2A-199B625C2584}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • AsHide.sHide

Step 5

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{4bf41072-b2b1-21c1-b5c1-0305f4155515}
    • StubPath = "%System%\JK~.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}\TypeLib
    • Version = "2.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
    • ProgID = "AsHide.sHide"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
    • TypeLib = "{1C0F29D4-5E6C-44ED-AABD-7E77A9A8C9C1}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D11DB99-60E8-4D12-9F2A-199B625C2584}
    • VERSION = "2.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AsHide.sHide
    • Clsid = "{6D11DB99-60E8-4D12-9F2A-199B625C2584}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
    • ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{123E26D9-0733-437C-B579-A3B1F32A5DDE}
    • ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Step 6

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Windows%\ILTZ.bat
  • %Windows%\IOTZ.bat
  • %Windows%\DLL.bat
  • %Windows%\GHO.bat
  • d:\Rabbit.exe
  • e:\Rabbit.exe
  • f:\Rabbit.exe
  • %System Root%\Rabbit.exe
  • h:\Rabbit.exe
  • g:\Rabbit.exe
  • d:\AutoRun.inf
  • e:\AutoRun.inf
  • f:\AutoRun.inf
  • %System Root%\AutoRun.inf
  • h:\AutoRun.inf
  • g:\AutoRun.inf
  • %Windows%\loveRabbit.bat
  • %System%\sha~.bat

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_VB.DIL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {4bf41072-b2b1-21c1-b5c1-0305f4155515}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
    • {4D36E967-E325-11CE-BFC1-08002BE10318}
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network
    • {4D36E967-E325-11CE-BFC1-08002BE10318}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AsHide.sHide
    • Clsid


Did this description help? Tell us how we did.